Weld Quality: The Role of Computers

Preface

Foreword

List of Papers

Session I Design, Calculation and Prediction Models for Metallurgical Processes

I.1 Improved Weld Quality with Special Reference to Computer Technology. The Design Function

Abstract

Introduction

The Process of Design

Sources of Uncertainty in Experimental Results

Sources of Uncertainty in Practice

Provision of Design Data by Computer Technology

Expert Systems in Design

Conclusion

References

I.2 Computer-Aided Design System for Fillet Welded Joints

Introduction

Conclusions

References

I.3 Design Stress for Plate and Shell Welded Connections: Concept, Definition and Improvement

Abstract

Keywords

Introduction

Stress Analysis

Stress Concentration and Hot Spot Stress

Computer, Numerical Analysis and Design Stress

Conclusion

References

I.4 Optimization by Numerical Simulation of the Brazed Joint's Mechanical Resistance

Abstract

Keywords

I - Data

II - Method of Analysis

III - Brazed Assembly in Plane Stresses: Extremely Thin Joint

IV - Asymmetrical, Hypothesis, and Data

V - Brazed Joint Where the Joint is Parallel to the Stresses

I.5 Mathematical Description of HAZ Behavior of Low-Alloyed Structural Steels

Abstract

Keywords

Introduction

HAZ-Simulation Studies on Low-Alloyed Steel Type 19MnA16

HAZ-Description Using Parametric Equations

Mathematic Modeling of the Microstructural Changes in the HAZ

Discussion and Conclusions

References

I.6 Weld Formation Simulation and Optimization of Stainless Steel Automatic Argon Tungsten Arc Welding Conditions

Conclusions

References

I.7 A Computer Model for Estimating the Risk of Sensitization When Welding Stainless (18/8) Steels

Abstract

Keywords

Introduction

Heat Transfer during Welding

Sensitization Damage Parameter

Computer Solution and Results

References

I.8 The Design of Submerged Arc Weld Deposits for High-Strength Steels

Abstract

Keywords

Introduction

Experimental

Results and Discussion

Conclusions

Acknowledgments

References

Session II Inspection and in-Service Monitoring

II.1 Acoustic Emission Testing (AET) Experience with an Integral Nondestructive Inspection Method for Pressure Vessels

Abstract

Keywords

Introduction

Inspection System

Application of Technology

From TÜV Vienna Performed Tests

Conclusion

References

II.2 Computer Aided Design of Eddy Current Weld Inspection, Optimization of a Multifrequency Approach

Abstract

Keywords

Introduction


2. Principle of the Eddy Current Method


3. Eddy Current Procedures

References

II.3 Holographic Imaging of Cracks in Welds

Abstract

Keywords

Introduction

The Concept of Holography: Backpropagation of Scalar Wavefields

Holographic Imaging with Elastic Waves

References

II.4 Robot for Real Time Radiographic Inspection of Circonferential Weld with Computer Processing of the Whole System

Abstract

Introduction

Inconvénients de la Radiographie Conventionnelle

Contraintes Liees a l'Implantation de la Radioscopie sur Barge de Pose

Description du Systeme de Controle

Resultats

Session III Fabrication, Quality Assurance

III.1 Development of a Microprocessor-Based System to Determine Resistance-Spot-Weldability and Perform Electrode-Life-Tests Automatically

Abstract

Key Words

Introduction

Initial Results

Goals and Future Prospects

III.2 Friction Welding — Computer-Aided Quality Inspection

Abstract

Keywords

Introduction

Computer Controlled Friction Welding

Principles of Computer-Aided Process Monitoring

Experimentals

Conclusion

References

III.3 Support of Quality Assurance Activities and Weld Inspection by Means of Computer-Aided Data Acquisition and Documentation

Abstract

Keywords

Introduction

Possibilities of Computer-Aided Data Acquisition (CAQ)

CAQ in the Organization of Non-Automated NDE Weld Inspection

CAQ in the Production of Longitudinally Welded Stainless Steel Tubes

Session IV Expert Systems, Data Banks and Future Possibilities

IV.1 The Welding Institute Approach to Writing Information Software for Welding Engineers

Summary

Keywords

Introduction

Software Packages

Welderqual

Weldspec

Weldvol and Weldcost

Preheat

Expert Systems

Expert Systems in Welding

Future Work

References

IV.2 Base de Données Pour le Soudage Adaptatif en MIG Pulsé

Resume

Mots Cles

Introduction

Conditions Experimentales

Methodologie de Constitution de la Base de Données

Les Resultats Experimentaux

Discussion sur les Resultats

Conclusion

References

Remerciements

IV.3 Experimental Design System for Solving the Problems of Welding Operational Parameters Optimization

IV.4 Expert System Improves the Robotic Welding Procedure

Abstract

Keywords

Introduction

Possible Replacement of Welder's Tasks by Artificial Intelligence

Description of the Welding Expert System

The Expert System in the Welding Control Loop

Future Developments

Conclusions

References

IV.5 Welding Expert System: From the Welsys Experience

Abstract

Keywords

Introduction

Motivation

Aims of the Project

Organization

First Year Activities

What We Learned from the First Year Activity

Second Year Activities

What We Learned from the Second Year Activities

What We Suggest from this Experience

References

IV.6 Weldex: An Expert System for Designers

Abstract

Keywords

Introduction

Artificial Intelligence Approach for Welding Technology

System Architecture and Functional Design of "Weldex" System

Conclusion

References

Posters

Evaluation of Residual Stress States in Welded Parts — Using Ultrasonic Techniques

Abstract

Keywords

What are the Major Difficulties? - What Has Been Achieved?

References

A CAD/CAM Tool for Structural Welding

Abstract

Keywords

Introduction

Computer-Aided Design System for Estimation of Fatigue Life of Welded Joints under Low-Cycle Loading

References

Comparison of Methods for the Description of the Thermal Cycle during Welding

References

Microcomputer Control of Resistance Welding Quality

Abstract

Keywords

Introduction

Vöz-M1 Control System

References

Self-Tuning Regulator for the Selected MAG Technology Process

Abstract

Keywords

Foregoing Approach to MAG Process Control

New Approach to Process Control

Characteristics of the Selected MAG Technology

Conclusions

References

"Synchronous Welding", an Automatic Technique for MIG Welding

Abstract

Keywords

Introduction

Principle Characteristics of System

Implications

Computer Control of Welding Parameters for Improvement of Weld Quality

Abstract

Keywords

Introduction

Experimental

Discussion

References

Adaptive Control of MIG/MAG Welding — Feedback System for Weld Penetration Control

Abstract

Keywords

Adaptive Control of Pulse MIG/MAG Welding

Feedback Control of Weld Penetration (Pan, 1987b)

Reference

HPS — A High-Resolution Process-Orientated Seam Tracking System for In-Production Quality Assurance

Abstract

Keywords

Introduction

The Seam Tracking System "HPS"

Off-line Mobile Robot for Welding of Horizontal Fillets in Girder Structures

Automation in the Welding of Large Framed Cylinders

Abstract

Keywords

Introduction

Seam Tracking

System Control

Synchronous Welding

Summary

References

Recent Seam Tracking Equipment Development for Electron Beam Welding

Abstract

Keywords

Introduction

New Detector Design

Seam Tracking System

References

S.A.O. MIG-MAG: Prise en Compte des Phénomènes de Transfert D'arc

Resume

Mots Cles

Introduction

Description et Fonctionnement du Systeme

Exemples d'Application

Conclusion

The Development of a Microcomputer-Based Control System of the Machine for Ultra Thin Sheets Welding

Abstract

Keywords

Introduction

Constitution and Function of the Control System

Software Design and Debugging

Elimination of the HF Interference

Conclusions

References

Adjustment of Model of Arc Sensor for Adaptive Welding Robot

References

Development of an Automated Process Control for Mechanized Underwater Welding

Abstract

Keywords

Introduction

Description

Mode of Operation

Preliminary Experiments

Nondestructive Residual Stress and Hardness Evaluation at Weldments by Means of 3MA (Micromagnetic, Multiparameter, Microstructure and Stress Analysis)

Abstract

Keywords


3MA Testing Unit. Theorie of Operation

What Has Been Achieved? Difficulties

References

Alok-an Automated ut-System with Microprocessor Controlled Data Acquisition, Signal Processing and Computer Aided Defect Reconstruction — Applications in Weld Inspection

Abstract

Keywords

Introduction

Data Acquisition and Compression

Data Evaluation

Polyscope: Measuring System Developed for the Characterization of Weld Defects

Abstract

Introduction

Materiel Mis en Oeuvre et Logiciels

Fonctionnement

Conclusion

References

Quality Monitoring and Control System for Resistance Spot Welding Process

Abstract

Keywords

Instruction

System Hardware

System Software

System Functions

Experiments for Welding Procedures

Contrôle de la Qualité en Temps Réel dans la Domaine du Soudage par Résistance

Resume

Mots Cles

Introduction


1) Causes de "Non Qualite"


2) Moyens de Maintenir un Niveau de Qualite Acceptable


3) Principe de Controle de Qualite en Temps Reel


4) Les Applications en Production


5) Techniques Auto-Adaptatives, Qualite et Limite

Ultrasonic Weld Inspection with Synthetic Aperture Focusing Techniques (SAFT)

Abstract

Keywords

Introduction

Test Facilities

Experiments

Expert System Welda: A Welding Design Advisor for Trial Manufacture

Abstract

Keywords

Outline of the System

Rules and Control

Knowledge-Based Systems for Flaw Assessment

Abstract

Keywords

Introduction

A Text Animator for the New PD 6493

Charpy/Fracture Toughness Correlations for Ferritic Steels

Discussion

Investigation of Potential Application of Television in Microprocessor Systems for Consumable-Electrode Arc Welding Control

Conclusions

A New Type of TIG Welding Power Source with Artificial Intelligence

Abstract

Study on Real Time Quality Control of Resistance Spot Welding

Author Index

Subject Index